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Патент USA US3044231

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July 17, 1962
w. GRAF
'
3,044,221
GEAR GRINDING MACHINE
Filed Dec. 4. 1958
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July 17, 1962
w. GRAF
3,044,221
GEAR GRINDING MACHINE
Filed Dec. 4; 1958
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Wills GRAF
Irwin-rox
Unite States arent Ü” ICC
3,044,221
Patented lJuly 17, 19162
1
2
3,044,221
'
AWiili Grat, Zurich, Switzeriand, assigner to Maag Gear
both known in the art and represent an intentional devia
tion from the theoretically correct involute form of the
tooth llanks. In these two operations, certain zones of
the tooth flanks lare reduced or relieved. In the tooth
GEAR GRINDING MACHINE
Wheel ¿it Machine Company Limited, Zurich, Switzer
cross-section shown in FIG. 1, the pitch circle is des
ignated by d and the addendum circle by dk. 'I'he theo
retically correct involute profile commences at point 2
land
Filed Dec. 4, 1958, Ser. No. 778,223
Claims priority, appiication Switzerland Dec. 6, 1957
6 Claims. (Cl. 51-123)
and ends at point 5. The proiìle relief in a root zone
from point 1 to 3 and in an addendum zone from point
The present invention relates to improvements in gear 10 4 to 6 has for its object the realization of tip and root
relief. In IFIG. 2, b denotes the face width, the inter
mediate zone from line 8 to line 9 corresponding, in the
type comprising a grinding disc for each of the right-hand
intermediate prolile portion 3 to 4, to the theoretically
and left-hand tooth flanks of the gear to the ground.
correct position of the tooth flank. The zones 7 to 8
Such known machines and the machine disclosed herein
and 9 to 10 retreat more and more towards the tooth
operate according to the generating method. The term
end and in relation to the theoretical position. In prac
“proñle correction” defines a certain partial reduction or
tice, the delimitations as shown by the lines 8 and 9
relief of the tooth curve with a view, for example of tip
cannot be accurately localized and merge. into each other.
and/or root relief. The term “longitudinal crowning”
The assembly of the machine is shown in FIGS. 3 to 7
deñnes a zonewise reduction of the tooth end portions. 20 and, in a modification, from FIG. 8. O11 bed 11 of the
Thereby is avoided, for example upon deformation of
tooth grinding machine is mounted slide 12 longitudi
the pinion under load, a high strain in the tooth ends.
nally movable and carries cross-slide 13. On the latter
In known gear grinding machines of this type has
is mounted gear 14 to be ground which sits on shaft
been used a transmission of movement between the two
15. Shaft 15 is connected via an indexing attachment
-templates for proñle correction and crowning on one 25 16 and.17 to the rolling elements which comprise the
hand and one of the grinding discs on the other hand to
rolling cylinder 18 `and the steel tapes 19 and 20 slung
eliect the desired reduction of tooth proñle and tooth end
about same and secured thereto. The other ends of the
portions with respect to the theoretical shape; but such
two- steel tapes 19 and Zt) are retained by a yoke 21
grinding machines for proiile `corrections and, at right
angles thereto, longitudinal crowning of the -tooth of the
arrangement is relatively complicated and expensive.
which is mounted on slide 12. When slide 13 is moved
crosswise on slide 12, cylinder 18 rolls oir” on the taut
rolling tapes 19 and 20 and turns shaft 22 which via
Furthermore, the long transmission due to the different
position of the initial movements for proñle correction
and crowning, entails a certain loss of accuracy and thus
an uncertainty as to the magnitude of the flank reduc
tion which per se, is very small and has to be strictly
index lever 17, index gear 16 and work-holding shaft
15 is connected to blank 14 and imparts thereto the de
sired generating motion with respect to the two grinding
discs 23 and 24. 'Ihe cross-movementof slide 13 is
produced by a crank drive 25 which is operated by a
crankshaft 26, the details of such drive beingA not further
adhered to.- A further aggravatingfactor is the fact
that the transmission acts from each of the four tem
plates on to a separate mechanism for profile correction
and crowning. Although such arrangement appears to be
shown. On crankshaft 26 are mounted two templates
27 and 28 in the form of cam discs which actuate pis
in order on account of the fundamental independence of
the two relieving or crowning operations, the separate 40 tons 29 and 30. The respective piston chambers 31
mechanisms also contribute to a complicated synthesis
and 32 via two pressure lines 33 and 34 communicate
of the transmission of movement. Aggravating are also
with piston chambers 35 and 36 of housings 37 and 38
the great number of moving parts required for a gear
which are mounted on a crossbeam 39. The two pres
grinding machine comprising two grinding discs and oper
sure lines 33, 34 represent the hydraulic path as con
ating according to the generating principle.
Said disadvantagesare eliminated by the invention in
that the two templates for the two correcting operations
on one tooth ilank of the gear to be ground act on a
common mechanism which controls the additional move
45
nection of the two pistons 29, 85 and, respectively, 30
and 34. The drive of slide 12 for grinding the tooth
flanks across the face width, is derived from a piston
40 which receives pressurized oil via a hydraulic drive,
not` shown, and transmits the movement via piston rod
ment of one of the two grinding discs. It also is of ad 50 41 and bracket 42 on to slide 12. The straps 43 and 44
vantage when the common mechanism comprises a lever
are connected with the two templates 45 and 46 which
system in which the movement derived from one tem
are formed‘as cam discs and are also connected with
plate acts on a lever which is supported on an element
the slide 12 so that thetemplates rotate back and forth
of the mechanism for transmitting the movement from
in rhythm with the back -and forth movement of the
the other template.
55 slide 12. Said templates 45, 46 act on pistons 47, 48 of
Two forms'of the invention are shown in the drawings,
which the pressure chambers 49, 50 via pressure lines
in which FIG. 1 depicts in exaggerated form the cor
51, 52 are connected to piston chambers 53, 54 (FIG.
rected tooth curve as deviation from the theoretical in
7) and effect the hydraulic connection between the two
volute form and illustrates the section I-I of FIG. 2;
pistons 47, S3 and 48, 36 respectively. The housings 55,
FIG. 2 shows the crowned tooth end portions in exag 60 56 which comprise piston chambers 53, 54 are pivoted
gerated form in a top plan view; FIG. 3 illustrates the
on axles 57, 58`to crossbeam 39. The housings 55, 56
machine disclosed herein in a side view, various details,
are each provided with an arm 59„ 60 which axially
however, being shown in section; FIG. 4 shows the ma
moves
grinding disc 23 and 24 respectively, via rollers
chine in plan; FIG. 5 depicts a cross-section on the line
61, 62 of said arms 59 and 60, sleeves 63 and 64, and
V--V of FIG. 3; FIG. 6 is an elevation of the generat
thereby move the grinding spindle carriers 67 and 68
ing mechanism, seen in direction of the arrow VI in
respectively. The latter are movable on crossbeam 39
FIG. 3; FIG. 7 shows the crossbeam with the grinding
and suitably loaded in the direction of movement by an
disc supports, similar to FIG. 5 but in a larger scale and
additional force which acts unidirectionally on the car
partly in section on the line VII-_VII of FIG. 3; FIG. 8
depicts a modiiication of the parts shown in FIG. 7.
70 riers and is represented by a spring 69. The spindles
FIGS. 1 and 2 depict the production of the proiile
65, 66 may be constructed as shown in FIG. 7 in that
correcting and crowning operations which, per se, are
they are provided with extensions 71 and 72 and used
3,044,221
3
carriers.
Y
`
each stroke moves into a definite absolute position, i.e. is
'
gauged.
Apart from housing 55 on one side and housing 56
on the other side of crossbeam 39, also an arm 73 and
74 is mounted on axle 57 and 58 respectively. Each of
the two arms 73,74- possesses an angularly adjustable
In a manner similar to, the partial reduction or relief
of the right-hand tooth flanks, the reduction or relief of
individual portions of the left-hand tooth ñanks of the
gear to be ground is eiîected via template '28, piston 39,
the liquid in piston chamber 32, in line 34 and in piston
member 75, 77 and 76, 7S respectively, which are tight
cned by clamping means on arm 73 and 74 respectively.
The active face of member 75 thereby contacts a roller
chamber 36, piston 84, roller Si?, member 76, arm 74,
axle 58, arm 60, roller 62, socket 64, threaded spindle
66, grinding disc carrier 68 and grinding disc 24. Gaug
ing is effected here through a peak lili) of template
2S, analogous to peak 99 on template 2‘7.
`Independently of the reduction described above of in
79 which is related to a piston 83 of housing V5,5'. Simi
larly, the active face of member 77 contacts a roller 81
related to a piston 85 of housing 37. In like manner, the
active faces of members 76 and 78 4are related to the roll
ers 80, 82 of the pistons 84, 86 which slide in the hous
ings 38 and 56. The pistons 83 .to S6 through the' re
spective piston springs 87 to 90 are pressed against the
liquid pressure of the liquid present in the piston cham
bers 35, 36, 53 and 54.
ì
4
piston 85 at each rolling movement or, respectively, at
for manual setting of the roller-mounted grinding-spindle
dividual tooth-curve portions, such as for tip and root
relief, the following description explains the reduction
- oí individual zones of tooth tianks with respect to the
'face width, for the purpose of avoiding edge pressure
engagement. The arrangement according to the inven
tion does Vnot exclude the combination of tip and root
-
In each of the housings 37, 48, 5S »and 56 is provided
an annular groove 9S to 98 which in terminalposition
of the pistons 83 to S6 returns the oil which has been
supplied through the pressure lines 33, 34, 51 and 52,
reiief and crowning as used Vin most cases.
By reason of the different radialdistances of the con
through the lines 91 to 94 back into the oil reservoir.
The mode of operation of the machine is derived from
the movement of the two templates 27, 28 for profile
« in known manner, into piston chamber `49 is forced by the
tour of template 45, piston 47 is moved during the
longitudinal Ymovement of slide 1-2, and Vthe oil supplied,
correction, which movement is synchronous with the’gen
erating movement of slide 13, and from lthe movement
of the two templates 45, 46 for crowning, which move
ment is synchronous to theV longitudinal movement of
slide 1'2. The templates 27, 45 are destined for deter 30
`downward piston movement through line 51 (FIGS. 3
to 5 and 7) into piston chamber 53. Piston 83 thereby’
is move upwardly against the pressure of spring 87,
and roller 79 moves along member 75 which is secured to
arm 73. Since the latter, however, is supported on
roller 81 through member 77, housing 55 is turned clock
mining the rate of reduction of single Zones of the right
wise on axle 57, whereby arm 59 via roller 61, sleeve
hand tooth Hanks, while the templates 2S, 46 are destined
63, and threaded spindle 65 moves grinding spindle 67
for determining the rate of reduction of single Vzones of
and, thus, also grinding disc 23 axially to the left. There
the left-hand tooth flanks of the gear to be ground.
by more material is'ground off from the right-hand tooth
By reason of the diiîerence between the radial Vdis
ñank in certain zones than would correspond to the posi
«tances of the contour of template 27, piston 29 is moved
tion of the grinding disc occupied till now. The rate
during the generating movement of slide 13, and the oil
of this additional abrasion is given by the radial differ
pumped as known by a pump into piston chamber 31,
ence of the template. The position of the zones of re
is forced by the downward piston movement through the
line 33 (FIGS. 3, 5 and 7) into piston chamber 35. Pis 40 duced proñle with respect to the face width b depends on
the position of the rises or swells of the template in the
ton 85 thereby is moved upwardly in housing 37 and
circumferential direction and on the existing position of
swings arm 73 through roller S1 and member 77 clock
the grinding discs with respect to the gear to be ground
wise on axle 57. Grinding disc '23 thereby is moved
and the position thereof relatively to slide 12.
slightly to the left through grinding spindle carrier 67
A peak 161 on template 45, located at a point corre
and via threaded spindle 65, sleeve 63, roller 61 and arm
sponding to the position of the grinding disc beyond the
59 of housing 55, whereby more'material is ground oiî
face width b (FIG. 2), gives origin to a further displace
from the right-hand tooth iiank than would correspond
ment of grinding disc 23 to the left. At the same time,
to the generating movement without the axial movement
however, also piston 83 is raisedV so far that the pumped
of the described grinding disc. By dimensioning the tem-v
plate in accordance with the ratios between the template . - pressurized oil may ñow out of piston chamber 53 into
recess 95 of housing S5 and thence into the reservoir.
radial distances and the axial movement of the grinding
By a slight excess or over-dosage of the oil quantity
disc aty a certain position of the angularly adjustable
members 75, 77 and 76, 78 respectively, the rate ofre
duction of the ñanks Vrelatively to the theoretical posi
tion may be determined. » When one of the members 75
to 7S is angularly adjusted, the ratio is influenced, and
thus the magnitude of the respective >movement and
thereby the rate of relieving may be set steplessly. The
`position of the zones to be reduced on the tooth flank may
for this terminal position of piston S3, eventual leakage
is compensated at each stroke of slide 12 and simulta
neously the position of piston 83 is gauged at each
stroke.
.
,
‘
In like manner, the partial reducing or crowning of the
left-hand tooth ñanks is eiîected via template ‘46, piston
48, 'the oilrin piston chamber S0 and line 52 and piston
be determined by the position of the swells or rises on the V60 chamber 54, piston 86, roller ÁS2, member 73, housing
‘56 through axle 5S on toV arm 60, roller 62, socket 64,
template in the peripheral direction and with respect to
the generating movement. "
'
'
.
,
A peak 99 at a point of template 27 which corresponds
Yto agenerating position of grinding disc 23 withrresprect ,
to the tooth beyond addendum circle 'dk or respectively,4
outside of point 6 (FIG. 1) gives origin to a further
>'movement of grinding disc 23 as well as of Vpiston 8S into
threaded spindle 66„ grinding-spindle carrier 68 and
Vthrough the axial movement of grinding disc 24. Gaug
ing in this case is effected by the peak 162 and the posi
tion of recess 98.
'
A modiñcation for solving the inventive idea is shown
in FÍG. 8 in which is shown only the machining of the
left-hand tooth flanks and the corresponding adaptation
' a terminal position which, however, is limited by an an
of the means in lieu of the means shown in FIG. 7. The
nular groove 97. By a‘small excess or over-dosage of
the oil quantity in this extreme position and by a cor 79 right-hand tooth flanks are machined by elements which
are disposed symmetrically with respect to the means
responding slight superelevation of point 99 on the tem
shown. The lower portion of bed 1:1 is otherwise iden
plate, it is ensured that also in case of certain leakages
tical with the illustration in FIGS. 3 to 6. The tem
Vin the lines there Vis always enough oil between the co- '
plate 146, formed as a cam disk, takes the yfunction of
?operating-pistons 29, '85 which are connected by a single
the template 46 shown in FÍGURE 4, but is mounted
pressure line 33, and that in the extreme position the
3,044,221
v6
on the cross bar 39. Its to and fro rotating movement is
by a mechanical connection connected with the to and fro
movement of the slide 12. The radial differences on
7) provides not only a common device for controlling ’the
deilections for a reduction of the tooth-curve and tooth
ilank, i.e. tip and root relief and crowning by means of
the additional grinding-disc movements depending on the
rolling and longitudinal movement, but these movements
which depend on the rolling and longitudinal movement
may also be combined with each other and independent
of each other as desired. Thereby it is made possible
the circumference of the template give rise, via roller
280, to a swinging movement of arm 204 and of the
slotted piece 208 iixed thereto.
Arm 204 is drawn
against template 146 by spring 202 and is mounted on
the crossbeam by means of a pedestal 286. In slotted
piece 208 is guided a sliding block 210 which carries a
to retract such a corrected profile as a whole also across
roller 212, the spacing between the roller axle and the 10 the face width. On the right-hand tooth flank, the com
pivot axis of arm 284 being adjustable by means not
mon device of the construction shown in -FIG. 7, on to
shown but in known manner. Roller 212 contacts a
which act the templates 27 and 45 for the tip and root
plane 214 which extends substantially radially with re
relief -and crowning features, comprises the following
spect to the swing axle 158 of arm 17-4. Axle 158 is
parts and units: arm 73 with the two angularly adjust
secured to crossbeam 39 and is functionally identical with
able members 7S and 77, the two rollers 79, 81 with the
axle 58 of FIGS. 5 and 7. To arm 174 is pivoted a
appurtenant pistons 83, 85 and the springs 87, 89 and the
member 176, the rate of -swing being adjustable through
housings 37 and 55, further the arm 59 and the axle 57.
a set screw 216 and readable on a scale 218 as size of
The common device on the left-hand tooth flank com
the tip and root relief.. A roller 188 which is connected
prises the arm 74 with the two angularly adjustable mem
to a piston 184 contacts the active face of member 176. 20 bers 76 and 78, the two rollers 88 and 82, the pistons
Piston 184 is pushed upwardly in the piston housing 1138
84 and 86, the springs 88 and 90, the housings 38 and
by a spring 18S and against the liquid pressure prevailing
S6, the lever 60 and the axle 58.
i
in piston chamber 136. The latter via a pressure line
The lever system of the common device comprises the
L134 communicates with piston chamber 32 of piston 30
arm 73 and the arm 59 which is integral with housing 5S.
and thus is directly related to template 28 which rotates 25 The movement derived from the tip and root relief tem
synchronously with .the to-and-fro rolling movement and
plate 27 acts through roller 81 on to member '77 of arm
gives origin to the proíile reduction of the left-hand tooth
73 and is supported through member 75 on roller 79, i.e.
flanks.
An annular groove 196, executed as recess in
an element of the mechanism for transmitting the move
the bore of housing 138, communicates with an oil drain
ment for the crowning operation.
192, i.e. with the oil reservoir. Housing 138 is pivoted 30 The common-device in the construction of FIG. 8, on
on axle 158 and also carries a lever 160. The latter via
to which act the relief and the crowning templates 28 and
a link 220, a bell crank 222pivoted to crossbeam 39, and
146 on one tooth flank, comprises arm 204 with slotted
a roller 162 is connected to a sleeve 164, a threaded
piece 288 and roller 212, arm 174 with member 176, roll
spindle 166, and, further, via the grinding-spindle carrier
er 180 with piston 184 and spring 188, housing 138 with
168 to the axially movable grinding disc 24 which grinds 35 lever 166, and axle pin 158.
'
the left-hand tooth flanks of the gear to be ground. The
In'this latter case, the lever system of the common de
function of this modification shown in FIG. 8 is derived
vice comprises arm 174 and lever 160 which is integral
from said rotary movement of template 146 which is
with housing 138. The movement derived from the relief
synchronous with the longitudinal movement of slide 12.
template 28 acts through roller 186 on to member 176
The rate of radial differences along the periphery of tem- - 40 and, through arm 174 and active face 214 thereof, on to
plate 146 defines the rate of swing of arm 204, the swing
roller 212 which is an element of the mechanism for the
lng movement transmitted on to arm 174 being dependent
transmission of the crowning movement.
on the set `spacing between the pivotal center of arm 204
What I claim as new and desire to secure by Letters
and the center of roller 212, and the rate of crowning
being steplessly regulable through the radial setting of
roller 212.
Arm 174 via member 176 and roller 180
abuts against housing 138 and thereby transmitsl the
swinging movement via lever l160, link 220, bell crank
222 and roller 162 on to sleeve 164. By angularly ad
justing the member 176, the rate of relief may be step
lessly varied. Said swinging movement of bell crank
222 via grinding-spindle carrier 168 is directly related
to the axial position of grinding disc 24. A deflection of
roller 208 by template 146 thus corresponds to a devia
tion of the left-hand theoretical flank. VWhen the grind
Patent is:
45
movable transversely on said first slide, means for mov
ing said slides, a shaft for supporting a gear workpiece
mounted on said second slide, a pair of grinding discs,
50 supports for said discs slidable transversely of said bed
for movement toward and from a tooth flank, means for
operating said grinding discs, means for generating a nor
mal involute movement to said workpiece relative to said
grinding discs, a first template controlling the profile cor
rection upon the right hand tooth ilank of said gear work-V
ing spindle does not move axially, said flank forms a
straight line when developed in a plane.
When piston 184 and thus also roller 180 is moved,
in accordance with the dellection of piston 38 by the rota
y
1. A gear grinding machine comprising a bed, a first
slide movable longitudinally of said bed, a second slide
piece movable synchronously with the generating move
ment of said second slide, a second template controlling
the crowning correction upon said right hand tooth ilank
movable synchronouslyv with the longitudinal movement
60 of said first slide, a third template controlling the pro
tion of template 28 in dependency on the rolling move
ment of slide 13, via pressure line 34 and pressure line
134 connected thereto, such movement through the sup
port of roller 180 on the active face of member 176 is
transformed into a swinging movement of housing 138,
whereby sleeve 164 and the threaded spindle í166 are 65
ñle correction upon the left hand tooth ilank of said work
piece movable synchronously with the generating move
ment of said second slide, a fourth template controlling
the crowning correction upon the left hand tooth llank
movable synchronously with the longitudinal movement
axially moved via lever `160,v link 220, bell crank 222
of said first slide, a first common means controlled by
and roller 162. Thereby grinding disc 24 also is axially
said ñrst and second templates for moving one of said
moved and the left-hand profile is altered with respect to
discs to accomplish the profile and crowning corrections
the theoretical involute shape, since the profile is gen
on the right ilank of a tooth of said workpiece and a sec
erated involute-like by the action of the generating mech 70 ond common means controlled by said third and fourth
anism when the grinding disc is axially immovable.
templates for accomplishing the same corrections on the
The construction according to FIG. 7 and the modifica
left flank of a tooth, hydraulic transmissions extending
v tion according to FIG. 8 and particularly the alternating
support of the rollers iniluenced by the templates on the
from said first and second templates to said first common
means and hydraulic transmissions extending from said
active face of the pivotable members (as shown in FIG. 75 third and fourth templates to said second common means.
3,044,22 t
t
y
2. A gear grinding machine comprising a bed, a first
fslide movable longitudinally of said bed, a second slide
movable transversely on said first slide, means for mov
ing said slides', a shaft for supporting a gear workpiece
mounted on`said second slide, a pair of grinding discs,
supports for said discs slidable transversely of said bed
for movement toward and from a tooth flank, means for
operating said grinding discs, means for generating a nor
mal involute movement to Vsaid workpiece relative to
said grinding discs,v a first template controlling the prolile
correction upon the right Vhand tooth flank of said gear
ing discs, a first template controlling the profilecorrection
upon theV right hand tooth yflank yot’ said gear workpiece
movable synchronously with t Ve :generating movement of
Vsaid second slide, a second'template controlling the crown
ing correction upon said right hand tooth flank movable
synchronously with the longitudinal movement of said
tirst slide, a third template controlling the profile cor
rection upon the left hand tooth ñank of said workpiece
movable synchronously with the generating movement >ot
l() said second slide, «a fourth template controlling the crown
ing correction upon the left hand tooth flank movable _
workpiece movable synchronously with the generating
synchronously with the longitudinal movement of said
movement of said second slide, a second template con
lirst slide, a ñrst common means controlled by said tirst
and second templates for moving one of said discs to ac
trolling the crowning correction upon said right hand
tooth flank movable synchronously with the longitudinal
movement of said iirst slide, a third template controi
ing the proñle correction upon the left hand tooth iiank
of said workpiece movable synchronously with the gener
ating movement of said second slide, a fourth template
controlling the crowning correction upon the left hand
tooth flank movable synchronously with the longitudinal
movement of said lirst slide, a iirst common means con
trolled by said first and second templates for moving
one of said `discs to accomplish the proñle and crowningV
corrections on the right flank of a tooth of said workpiece,
complish the profile and crowning corrections on the right
tlank of a tooth of said workpiece, a second common
means controlled by said third and fourth templates for
,accomplishing the same corrections on the left ñank of a
tooth, and >each of said common means having «an arm
with an angularly adjustable member on which acts the
movement derived from one of said templates to step
lessly-adjust in size the Iaxial movement of one of said
grinding discs corresponding to »a definite stroke of the
template associated therewith.
5. A gear grinding machine comprising a bed, a first
slide movable longitudinally of said bed, a second slide
movable transversely on said ñrst slide, means for moving
said slides, a shaft for supporting a gear workpiece mount
on the left Hank of a tooth, hydraulic transmissions ex
ed on said second slide, a pair of grinding discs, supports
tending from said first and second templates to said iirst
common means, hydraulic transmissions extending from 30 for said discs slidable transversely of said lbed for move
ment toward and from a tooth flank, means for operating
said third and fourth templates to said second common
said grinding discs, means for generating a normal in
means, and a cylinder containing a piston actuated by
volute movement to said workpiece relative to said grind
each of said templates to control the common means
a second common meansV controlled by said third and
fourth templates for accomplishing the same corrections
ing discs, a first template controlling the profile correc
associated therewith through its associated transmission.
3. A gear grinding machine comprising a bed, la iirst C0 Cal- tion upon the right hand tooth dank of said gear Work
'piece movable synchronously with the generating move
slide movable longitudinally of said bed, a- second slide
ment of said second slide, a second >template controlling
movable transversely on said iirst slide, means for moving
the crowning correction upon said right hand tooth flank
said slides, a shaft for supporting a gear workpiece mount
`movable synchronously with the longitudinal movement
ed on said second slide, a pair of grinding discs, supports
of said iirst'siide, a third template controlling the profile
for said discs slidable transversely of said bed for move
ment toward and from »a tooth ilank, means for operating
said grinding discs, means for generating a normal in
volute movement to said workpiece relative to said grind
correction upon the left hand tooth ñank of said work
piece movable synchronously with the generating move
ment of said second slide, a fourth template controlling
the crowning correction upon the left hand tooth Hank
ing discs, «a first template controlling the proñle correction
upon the right hand tooth ilank of said gear workpiece 4.5 movable synchronously with the longitudinal movement of
said first slide, ‘a first common means controlled by said
movable synchronously With the generating movement of
first and second templates for moving one of said discs
said second slide, la second template controlling the crown
to accomplish the prolile and crowning corrections on the
ing correction upon said right hand tooth flank movable
right flank of a tooth of said workpiece, a second com
synchronously with the longitudinal movement of said
ñrst slide, a third template >controlling the profile cor 50 mon means controlled by said third and fourth templates
for accomplishing the same -corrections on the left ñank
rection upon the left hand tooth llank of said workpiece
of a tooth, each of said common means having an arm
movableisynchronously with the generating movement of
with two angularly adjustable members on which act the
said second slide, a fourth template controlling the
movements derived from the templates associated there
crowning correction upon Íthe left hand tooth flankmov
able synchronously with the longitudinal movementV of 55 with to steplessly and independently .adjust the axial move
ment of the grinding disc -associated therewith correspond
ï said ‘first slide, a ñrst common means controlled by said
ing to a definite stroke of the templates associated with
tirst and second templates for moving one of-said discs
said grinding disc.
Y
'
to Iaccomplish the proñle vand crowning corrections on the
6. A gear grinding machine comprising »a bed, a first
right ñank of a tooth or said workpiece, a second com
mon means controlled by said third and fourth templates 60 slide movable longitudinally of said bed, a second slide
movable transversely on said ñrst slide, means for moving
tor accomplishing the same corrections on the left flank of
va tooth, a piston reciprocating in a cylinder actuated by
each template and `a hydraulic transmission interconnect
ing each cylinder with’its coordinated common means and
means for draining hydraulic fluid above a predetermined
amount in saidfcylinders.
4. A gear grinding machine comprising' a bed, a iirst
slide Vmovable,longitudinally oifsaid bed, a second slide
mov-,able transversely on said first slide, means for moving
said slides, a shaft Íor supporting a gear workpiece mount
ed on said second slide, a pair of grinding discs, supports
for Lsaid discs slidable transversely of said bed for move
ment toward and from a toothliank, means for operating
said slides, a shaft for supporting a gear workpiece
mounted on saidV second slide, a pair of grinding discs,
supports for said discs slidable transversely of said bed
for movement toward and from a tooth ñank, means for
operating said grinding discs, means for generating a
normal involute movement to said workpiece relative to
said grinding discs, a ñrst template controlling the «profile
correction upon the right hand tooth flank of said gear
workpiece movable synchronously with the generating
movement Vof said second slide, a second template con
trolling the crowning correction upon said right hand tooth
flank mov-able synchronously with the longitudinal move
ment 4of said tirst slide, a third ltemplate controlling the
said grinding discs, means for generating anormalm
volute movement to said workpiece relative 4to said grind 75 proñle correction upon the left hand «tooth flank of said
3,044,221
workpiece movable synchronously with the generating
movement of said second slide, a four-th temp-late con
trolling the crowning correction upon the left hand tooth
ílank movable synchronously with the longitudinal move~
ment of said Íìrst slide, `a Íìrst common means controlled
by said first and second templates for moving one of said
discs to accomplish the profile and crowning corrections
on the right ñank of a tooth of said workpiece, a second
common means controlled by said »third and fourth tem
plates for accomplishing the same corrections on the left l0
ñank of a tooth, each of said common means for moving
said grinding discs comprising a pair of cylinders and co
1i)
operating pistons, each of said pistons being controlled
in its movement by a template associated therewith, one
or" said cylinders being pivotally mounted and havin-g a
lever for moving the associated grinding `disc and a pivot
ally mounted plate under the control of both pistons for
controlling the pivoting of said pivotally mounted cylinder.
References Cited in the file of this patent
UNITED STATES PATENTS
2,879,630
Aeppli ______________ __ Mar. 3l, 1959
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